如何配置AI参数SK接口

1 App

应用代码一般在开发者的项目目录下，packages/apps/YourApp/，比如app/src/main/java目录下

对于系统应用，源代码可能位于packages/apps/目录下，例如packages/apps/Settings。

用户安装的应用（从Google Play或其他来源安装的APK）位于设备的/data/app/目录

系统应用（预装应用）位于/system/app/或/system/priv-app/目录

应用在Dalvik或ART虚拟机上运行

直接使用Framework服务

import android.myframeworkservice.IMyFrameworkService;
import android.os.ServiceManager;
import android.os.RemoteException;

public class MyActivity extends Activity {
    private IMyFrameworkService mFrameworkService;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mFrameworkService = IMyFrameworkService.Stub.asInterface(
                ServiceManager.getService("myframeworkservice"));

        if (mFrameworkService != null) {
            try {
                mFrameworkService.myFrameworkMethod();
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }
    }
}

2 Framework层

Framework服务的源代码主要位于frameworks/base/services/目录

Framework服务的代码编译后成为framework.jar和其他相关JAR文件，位于设备的/system/framework/目录

Framework服务在system_server进程中运行。system_server是由Zygote进程启动的，它包含了大部分系统服务，如ActivityManagerService、PackageManagerService等。

首先增加aidl

// IMyFrameworkService.aidl
package android.myframeworkservice;

interface IMyFrameworkService {
    void myFrameworkMethod();
}

用Java实现

// MyFrameworkService.java
package com.android.server;

import android.content.Context;
import android.hardware.myhal.IMyHalService;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Slog;
import android.myframeworkservice.IMyFrameworkService;
import android.os.ServiceManager;

public class MyFrameworkService extends IMyFrameworkService.Stub {
    private static final String TAG = "MyFrameworkService";
    private final Context mContext;
    private final IMyHalService mHalService;

    public MyFrameworkService(Context context) {
        mContext = context;
        mHalService = IMyHalService.Stub.asInterface(
                ServiceManager.getService("myhalservice"));
    }

    @Override
    public void myFrameworkMethod() throws RemoteException {
        if (mHalService != null) {
            mHalService.myHalMethod();
        } else {
            Slog.e(TAG, "HAL service not available");
        }
    }
}

在system manager中注册

import com.android.server.MyFrameworkService;

public class SystemServer {
    // Existing code...

    private void startOtherServices() {
        // Existing code...

        try {
            Slog.i("SystemServer", "MyFrameworkService");
            ServiceManager.addService("myframeworkservice", new MyFrameworkService(context));
        } catch (Throwable e) {
            reportWtf("starting MyFrameworkService", e);
        }

        // Existing code...
    }

    // Existing code...
}

3 HAL层

HAL服务的源代码通常位于hardware/interfaces/或vendor/目录

HAL模块通常以共享库（.so文件）的形式存在，位于/vendor/lib/hw/或/system/lib/hw/目录中。

定义服务

package android.hardware.myhal;

interface IMyHalService {
    void myHalMethod();
}

实现HAL服务，用C++

// MyHalService.cpp
#include <android/hardware/myhal/IMyHalService.h>
#include <hidl/LegacySupport.h>
#include <log/log.h>

using android::hardware::myhal::V1_0::IMyHalService;
using android::hardware::configureRpcThreadpool;
using android::hardware::joinRpcThreadpool;
using android::sp;

struct MyHalService : public IMyHalService {
    Return<void> myHalMethod() override {
        ALOGI("myHalMethod called");
        return Void();
    }
};

int main() {
    configureRpcThreadpool(1, true /*callerWillJoin*/);
    android::sp<IMyHalService> service = new MyHalService();
    if (service->registerAsService() != android::OK) {
        ALOGE("Failed to register MyHalService");
        return 1;
    }
    joinRpcThreadpool();
    return 0;
}

其实HAL也可以不封成AIDL。直接使用JNI，貌似也是可以的，各有利弊。

例子：

https://www.cnblogs.com/linhaostudy/p/12002068.html